package com.atguigu.gmall.all.controller;



import com.atguigu.gmall.common.result.Result;
import com.atguigu.gmall.model.product.BaseCategoryView;
import com.atguigu.gmall.product.client.ProductFeignClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.io.FileWriter;
import java.io.PipedWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

//首页
@Controller
public class IndexController {

    @Autowired
    private ProductFeignClient productFeignClient;


    @Autowired
    private TemplateEngine templateEngine; //Thymeleaf  首页  == 模板

    //首页
    @GetMapping("/")
    public String index(Model model){
        model.addAttribute("list",getData());
        //首页
        return "index/index";
    }

    //使用静态化程序生成首页  保存在指定的盘符挂载到Nginx服务上去
    @GetMapping("/createHtml")
    @ResponseBody
    public Result createHtml() throws Exception{

        //首页的生成   数据 + 模板 =Thymeleaf= 输出流 （将页面保存到指定的磁盘上）
        //参数1：模板
        //参数2：数据
        Context context = new Context();
        context.setVariable("list",getData());
    //这是写    //参数3：输出流//流：磁盘文件 读取流 utf-8 -->内存中 --> 写入流 utf-8 到磁盘上
        Writer writer = new PrintWriter("D:\\kuangjiaziliao\\temp\\index.html","utf-8");
        //静态化程序//这是读
        templateEngine.process("index/index",context,writer);
        return Result.ok();
    }


    public List<Map> getData(){
        List<Map> listMap = new ArrayList<>();
        //所有的分类
        List<BaseCategoryView> baseCategoryViewList =
                productFeignClient.getBaseCategoryViewList();

        //根据一级分类 Id  进行分组 返回值 Map
        Map<Long, List<BaseCategoryView>> baseCategoryView1ListMap = baseCategoryViewList.
                stream().collect(Collectors.groupingBy(BaseCategoryView::getCategory1Id));

        //1：前60个数据算一个Map
        baseCategoryView1ListMap.forEach((k,v)->{
            //一级分类
            Map category1Map = new HashMap();
            category1Map.put("index",k);
            category1Map.put("categoryId",k);
            category1Map.put("categoryName",v.get(0).getCategory1Name());//V:  List<BaseCategoryView>

            //二级分类
            Map<Long, List<BaseCategoryView>> baseCategoryView2ListMap =
                    v.stream().collect(Collectors.groupingBy(BaseCategoryView::getCategory2Id));

            List<Map> listMap2 = new ArrayList<>();
            baseCategoryView2ListMap.forEach((k2,v2) ->{
                Map category2Map = new HashMap();

                category2Map.put("categoryId",k2);
                category2Map.put("categoryName",v2.get(0).getCategory2Name());//V:  List<BaseCategoryView>

                //3:三级分类  V2  :List<BaseCategoryView>
                List<Map> listMap3 = new ArrayList<>();
                v2.forEach(baseCategoryView -> {
                    Map category3Map = new HashMap();
                    category3Map.put("categoryId",baseCategoryView.getCategory3Id());
                    category3Map.put("categoryName",baseCategoryView.getCategory3Name());//V:  List<BaseCategoryView>
                    listMap3.add(category3Map);
                });

                category2Map.put("categoryChild",listMap3);
                listMap2.add(category2Map);
            });
            category1Map.put("categoryChild",listMap2);

            listMap.add(category1Map);

        });
        return listMap;

    }
    //Velocity  Freemarker  Thymeleaf   静态化程序  也可以充当页面模板标签,还是代码生成器的主要语言


}
